Crossword Genius

William is able to cook in this vessel (5-3)

Ross

I believe the answer is:

billy-can

'cook in this vessel' is the definition.
(type of cooking pot)

'william is able to' is the wordplay.
'william' becomes 'Billy'.
'is able to' becomes 'can' (if you can do something you are able to do it).
'billy'+'can'='BILLY-CAN'

(Another definition for billy-can that I've seen is " Campfire pot".)

I've seen this clue in The Telegraph.
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